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A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of the plant and keep the plant growing. The shoot apical meristem (SAM) gives rise to organs like the leaves and flowers, while the root apical meristem (RAM) provides the meristematic cells for the future root growth.
meristem. (mÄr`istÄm') , a specialized section of plant tissue characterized by cell division and growth. Much of the mature plant's growth is provided by meristems. Apical meristems found at the tips of stems and roots increase the length of these sections.eristem. formative tissue, a plant tissue characterized by prolonged cell-division activity. Some cells of the meristemâthe initiating cellsâremain in the embryonic phase of development and, by dividing, provide uninterrupted growth of the plant body.